Ford's 300 hp V8 powered cars are just as fast as Chrysler's ZOMGDZ 10 bazillion horsepower HEMI cars, simply because the Mustang weighs about 800 lbs less.
Chevy is the one that's going to be bringing the noise, but Chevy has always overpowered Ford in that department - where Ford has excelled (and why the Mustang survived while the Camaro died out) is in the total package - the Mustang has always been a bit smaller (parking, turning radius anyone?), easier to live with and user friendly than the Camaro.
Not to mention, in my personal experience, Mustangs are almost always more reliable than Camaros.
Doesn't take away the fact that the LS1 powered Camaro was the greatest muscle car of all time.